Hi. It says in the Readme file in the XWisp2 distribution that the 12-bit PICs (such as 12F508/509) are not "supported by Wisp628"... Not much to do about that, I guess, but is there a simple way to describe what's special with these compared to, let's say, the 12F629/675 ? Best Regards, Jan-Erik. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist